Keeping a barrier treatment intact
Because the lead remains, an encapsulated or enclosed surface needs watching. Check it at least once a year and after any leak or impact, and repair damage promptly.
Future work matters too. Cutting into an enclosed wall or sanding an encapsulated surface later disturbs the lead paint underneath, so that job falls under the RRP rules. Commerce describes abatement as lasting more than 20 years; a barrier installed as abatement by a Commerce-certified firm is meant to meet that, whereas a coating applied during ordinary repainting is not. Keep a record of what was covered and where, since known lead paint must be disclosed when you sell or lease.
Encapsulation can sit beside exterior lead paint removal on the same house, while friction surfaces are better handled through lead-painted window and door replacement.